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their shells, taking into account all three types of foundations (A, B and C) and with the assumption of elastic-plastic model of steel. The stress-strain relationship for structural steel consisted of a linear and perfectly plastic region: f y = 235 MPa, e y = 0.1119 %. These relationships for the foundation of type A and B are presented in Fig. 7 ; other cases will be analyzed in point 5 ( Fig. 8 , Fig. 9 ). These relationships are of great practical importance, because on the basis of quite easy measurements of u r deformations of the lower part of the shell